Fig. 9
a Scanned bell geometry of the large Witlockx bell. b Computed vibratory responses of the bell velocity as a function of the impact location along the vertical direction, namely at heights hc = 0.2 h, 0.4 h, 0.6 h, 0.8 h and 0.95 h. mc = 13.8 kg, rc = 0.075 m, v0 = 0.1 m/s. c Computed vibratory responses as a function of the contact stiffness. a Kc = 1e10 N/m, hc = 0.2 h, mc = 13.8 kg, rc = 0.075 m, v0 = 0.1 m/s; b Kc = 1e11 N/m, hc = 0.2 h, mc = 13.8 kg, rc = 0.075 m, v0 = 0.1 m/s. d Computed power spectrum of the Mafra bell velocity at the contact point as a function of the clapper mass (\(r_{c}\) = 0.075 m, v0 = 0.1 m/s).